Facebook all.js and Google googleapis.client__plusone.js downloads twice

My website it shows all.js and __plusone.js as downloading twice in both Chrome and Firefox's web developer consoles. As far as I can tell, they aren't included in the page twice anywhere, so I'm not really sure what's going on.

I use the <fb:like and <g:plus markup, so it's not being downloaded through an iframe. Facebook is loaded asynchronously with window.fbasync = function() { loa开发者_JAVA百科d the js..} at the very bottom of the min.js script on that page. G+ just has the one JS file at the bottom of the page.

Any ideas what's going on?

an iframe is being created within the page when you add G+ and like. Looks like those iframes are referring to the files.